[PATCH] D51864: [Tooling] Restore working dir in ClangTool.

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov created this revision.
ilya-biryukov added reviewers: ioeric, steveire.

And add an option to disable this behavior. The option is only used in
AllTUsExecutor to avoid races when running concurrently on multiple
threads.

This fixes PR38869 introduced by r340937.


Repository:
  rC Clang

https://reviews.llvm.org/D51864

Files:
  include/clang/Tooling/Tooling.h
  lib/Tooling/AllTUsExecution.cpp
  lib/Tooling/Tooling.cpp

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